Color-control of the persistent luminescence of cadmium silicate doped with transition metals
- Laboratory of Advanced Ceramics Materials, Physics Department, Federal University of Sergipe, 49100-000 São Cristóvão, SE (Brazil)
The structural and optical characterization of cadmium silicate (CdSiO{sub 3}) doped with transition metals is reported. This crystalline system presents intrinsic luminescence and is usually studied as host matrix for rare earth ions. In this work, CdSiO{sub 3} was doped with Mn, Ni and Cr to produce multicolored luminescent materials. Single crystalline CdSiO{sub 3} was obtained via solid state synthesis at 1000 °C/8 h. The valence of the dopants inserted in the host matrix was determined via XANES as 3+ for Cr, 2+ for Ni and both 2+ and 3+ for Mn, according to XANES studies. The optical absorption spectra of the samples presented wide bands in the visible region that were associated with the internal transitions of the dopants. All the samples presented photoluminescent bands near 420 nm, 496 nm and 591 nm, with different relative intensities that yield characteristic luminescence colors ranging from blue to red. - Graphical abstract: Phosphorescence of cadmium silicate doped with transition metals: nature of defects and possible luminescent channels. Highlights: ► CdSiO{sub 3} was doped with Mn, Ni and Cr to produce multicolored phosphors. ► Valence of the dopants was determined as 3+ for Cr, 2+ for Ni and 2+ and 3+ for Mn. ► The presence of absorption bands in the visible region led to self-absorption. ► Self-absorption in some cases can decrease the light output. ► Luminescent channels were created and related to internal transitions of the dopants.
- OSTI ID:
- 22304532
- Journal Information:
- Journal of Solid State Chemistry, Vol. 200; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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